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CN-121760696-B - Underground multi-parameter logging device

CN121760696BCN 121760696 BCN121760696 BCN 121760696BCN-121760696-B

Abstract

The invention discloses an underground multi-parameter logging device, which belongs to the technical field of logging while drilling and comprises a drill collar, wherein battery modules and circuit modules are respectively arranged at two ends of an inner cavity of the drill collar and are axially fixed through locking modules, a metal centralizer is fixedly arranged in the inner cavity of the drill collar, a plurality of independent centralizing blocks are arranged at the center of the drill collar, the drill collar comprises a drill collar body, an antenna housing, a strip-shaped magnetic core and a coil, stable signal transmission is ensured, the battery modules comprise annular batteries and butterfly springs, can be replaced on site and have a damping function, the circuit modules comprise resistivity, azimuth gamma and inclinometry modules, are integrally designed and have strong interference resistance, the metal centralizer can realize self-adaptive centralization through centrifugal force and hydraulic damping, and the independent centralizing blocks can compensate temperature errors.

Inventors

  • GU PENG
  • SHI HAOZHEN
  • YU MIAO
  • FU CUILING

Assignees

  • 斯伦贝谢油田技术（山东）有限公司

Dates

Publication Date
20260508
Application Date
20260302

Claims (8)

  1. 1. The underground multi-parameter logging device comprises a drill collar (1) and is characterized in that a battery module (2) and a circuit module (3) are respectively arranged at the left end and the right end of an inner cavity of the drill collar (1), the battery module (2) and the circuit module (3) are axially fixed through a locking module (5), a metal centralizer (4) is fixedly arranged in the inner cavity of the drill collar (1), the metal centralizer (4) is used for centralizing a central shaft at the end part of the drill collar (1), and a plurality of independent centralizing blocks (6) which are circumferentially distributed are arranged at the center of the metal centralizer (4) and used for eliminating centralizing gaps; The drill collar (1) comprises a drill collar body (101), an antenna housing (102) is fixedly sleeved on the outer surface of the drill collar body (101), a plurality of groups of annular grooves are formed in the outer surface of the drill collar body (101), a plurality of circumferentially distributed windows are formed in the annular grooves, a strip-shaped magnetic core (103) is embedded in each window, and coils (104) are wound in the annular grooves; The metal centralizer (4) comprises a pair of opposite half rings (401), a plurality of through-flow channels (402) are formed in the opposite half rings (401), a pair of through-flow channels (402) are fixed between the opposite half rings (401) through screws (403) to form an annular whole, a pair of symmetrically distributed centrifugal channels (404) are formed in the inner cavity of the opposite half rings (401) close to the outer side edge, a mounting groove (405) is formed in the center of the opposite half rings (401), an independent centralizing block (6) is slidably mounted in the mounting groove (405), a centrifugal balancing weight (406) is slidably mounted in the centrifugal channels (404), a limiting ring (407) corresponding to the centrifugal balancing weight (406) is fixedly mounted in the centrifugal channels (404), a pre-tightening spring (408) is fixedly mounted between the centrifugal balancing weight (406) and the bottom wall of the centrifugal channels (404), a T-shaped runner (410) is communicated between the mounting groove (405) and the pair of centrifugal channels (404), a main piston (409) is slidably mounted at one end of the T-shaped runner (410) close to one end of the centrifugal runner (404), a pair of pistons (409) is fixedly connected between the main piston (412) and the main piston (406), the auxiliary piston (412) is fixedly connected with the independent centralizing block (6).
  2. 2. A downhole multi-parameter logging device according to claim 1, wherein the battery module (2) comprises a mandrel (201), two annular batteries (202) are mounted on the mandrel (201), an intermediate connecting disc (204) is arranged between the two annular batteries (202), and the intermediate connecting disc (204) is fixedly connected with the mandrel (201).
  3. 3. A downhole multi-parameter logging device according to claim 2, wherein a belleville spring (205) is mounted on the mandrel (201), the mandrel (201) is inserted into a pin hole on the drill collar body (101) through an anti-rotation pin (203) to realize anti-rotation, and a diversion head (206) is fixedly mounted at the end of the mandrel (201).
  4. 4. A downhole multi-parameter logging device according to claim 3, wherein the circuit module (3) comprises a circuit core frame (301), a measuring module (302) and a damping ring I (303) are fixedly arranged on the circuit core frame (301), a guide key (305) and an anti-rotation pin II (304) are arranged on the circuit core frame (301), and the guide key (305) is inserted through a guide key groove on the drill collar body (101) and is prevented from rotating by the anti-rotation pin II (304).
  5. 5. A downhole multi-parameter logging device according to claim 4, wherein a second flow guide head (306) is fixedly arranged at the end part of the circuit core frame (301), a second damping ring (307) is fixedly arranged on the second flow guide head (306), and the measuring module (302) comprises a resistivity measuring module, an azimuth gamma measuring module and a near-end inclinometry module.
  6. 6. A downhole multi-parameter logging device according to claim 1, wherein hydraulic oil is filled between the main piston (409) and the auxiliary piston (412), a porous damping plate (411) is fixedly arranged at one end of the T-shaped flow channel (410) close to the mounting groove (405), and the auxiliary piston (412) is arranged between the porous damping plate (411) and the independent centralizing block (6).
  7. 7. A downhole multi-parameter logging device according to claim 6, wherein the independent centralizing block (6) comprises a base block (601), a hidden groove is formed in the outer surface of the base block (601), a matched tightening block (603) is slidably arranged in the hidden groove, and a thermal expansion bimetallic strip (602) is fixedly arranged between the tightening block (603) and the bottom wall of the hidden groove.
  8. 8. The downhole multi-parameter logging device of claim 1, wherein the outer surface of the locking module (5) is provided with external threads (501), one end, close to the battery module (2) and the circuit module (3), of the locking module (5) is provided with a sealing ring (502), and a clamping groove (503) is formed in an opening at the outer side of the locking module (5).

Description

Underground multi-parameter logging device Technical Field The invention relates to the technical field of logging while drilling, in particular to a downhole multi-parameter logging device. Background In the field of petroleum and natural gas exploration and development, the logging while drilling technology is a core technology for acquiring underground stratum and borehole parameters in real time in the drilling process, can provide important data support for reservoir evaluation, borehole trajectory control and oil and gas content judgment, and is particularly suitable for complex well type operations such as horizontal wells, highly deviated wells, deep wells and the like. With the continuous increase of the drilling workload of horizontal wells and highly deviated wells on landing, the conventional cable logging has hardly satisfied the real-time and adaptability requirements, measurement While Drilling (MWD) and Logging While Drilling (LWD) systems have become indispensable core equipment in the field of petroleum drilling engineering, while the downhole multi-parameter logging device is used as a core component of the logging while drilling system, and the performance of the downhole multi-parameter logging device directly determines the accuracy of logging data, the stability of operation and the convenience of maintenance. Currently, the conventional downhole multi-parameter logging device has a plurality of technical defects in practical application, and the efficiency and quality of logging operation are severely restricted. In the aspect of the antenna and drill collar structure, the traditional device mostly adopts a structure of 'the drill collar winding bottom layer glass fiber reinforced plastic-slotting winding enameled wire-winding second layer glass fiber reinforced plastic-sleeve metal antenna housing', the structure has obvious hidden trouble that the glass fiber reinforced plastic is limited in strength, is easy to collapse under a high-pressure environment in the pit, directly causes the enameled wire to be damaged to cause instrument faults, has extremely high structural sealing requirements, is easy to cause mud to enter due to loose sealing to pollute a coil and a magnetic core, increases maintenance difficulty, and is easy to damage and fail due to long-term influence of mud scouring and high temperature, and the maintenance cost of replacing the antenna housing is high, is complicated to assemble and disassemble, and influences the operation progress. Meanwhile, the traditional drill collar material is easy to generate magnetic interference, influences the accuracy of electromagnetic parameter measurement such as resistivity and the like, and is difficult to adapt to the high-precision logging requirement. In the aspects of power supply and maintenance, most of battery modules of the traditional device are of an integrated fixed structure, after the battery is exhausted, the whole instrument is required to be returned to a base, and is replaced by a professional maintenance personnel, so that the round trip transportation time is long, the labor cost is high, the rotation efficiency of a field instrument is seriously affected, the quick operation requirement cannot be met, part of devices are powered by a single battery, no redundant backup is adopted, and the logging data is easily lost and the operation is easily interrupted due to battery faults. In the aspect of centralizing performance, the traditional centralizing device of the drill collar mostly adopts a fixed structure, centralizing gaps are difficult to eliminate, the centralizing device cannot adapt to the change of the rotating speed of the drill collar and the underground high-temperature environment, severe vibration generated during high-speed rotation of the drill collar is easily transmitted to a battery module and a circuit module through the device, so that measurement errors are increased, even part cracks and fractures are caused, part of the centralizing device adopts a nonmetallic material, is poor in scouring resistance and abrasion resistance, is damaged by slurry scouring for a long time, cannot guarantee the centralizing effect stable for a long time, and has unreasonable design of a flow passage, unsmooth slurry circulation, easy generation of siltation and scouring abrasion and influence on normal operation of the device. Disclosure of Invention 1. Technical problem to be solved Aiming at the problems in the prior art, the invention aims to provide an underground multi-parameter logging device which can meet the resistivity monitoring requirements while drilling of complex drilling scenes such as a horizontal well, a deep well and the like by integrating resistance data measurement, azimuth gamma measurement and well deviation measurement functions and provide technical support for an oil and gas reservoir. 2. Technical proposal In order to solve the problems, the invention adopts the following techn